Sumiko III was described as the location of the Emerald Wading Pool in the script of TNG: "Conundrum" opposed to the Cliffs of Heaven on Cirrus IV. In the actual episode the references got mixed up and the pool ended up on Cirrus IV, while the Cliffs were localized on Sumiko IV. However, the reference in First Contact apparently used the script as a source, thus canonizing Sumiko III as another location of an Emerald wading pool.